A power of 2. In the decimal system, we use powers of 10, in the binary system, powers of 2. Other number system use some other number as their base; for example, hexadecimal (base-16) uses powers of 16.
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If you mean how do you convert 8 into binary numbers, here it is. 8 -- Eights place value
In the number 36, the digit 3 is in the tens place. This means that the value of the digit 3 is actually 30, as it represents 3 tens or 3 groups of 10. The value of a digit in a number is determined by its position in the number relative to the place value system, where each place represents a power of 10.
Binary(101) = Decimal(5).
The binary number 10110 represents (1 x 16) + (0 x 8) + (1 x 4) + (1 x 2) + (0 x 1) and 16 + 4 + 2 = 22.
1001 in binary is equal to 9 in decimal.